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"""Hook for sending or receiving data from PagerDuty as well as creating PagerDuty incidents."""

from __future__ import annotations

from typing import Any

import pdpyras

from airflow.exceptions import AirflowException
from airflow.hooks.base import BaseHook


class PagerdutyHook(BaseHook):
    """
    The PagerdutyHook can be used to interact with both the PagerDuty API and the PagerDuty Events API.

    Takes both PagerDuty API token directly and connection that has PagerDuty API token.
    If both supplied, PagerDuty API token will be used.
    In these cases, the PagerDuty API token refers to an account token:
    https://support.pagerduty.com/docs/generating-api-keys#generating-a-general-access-rest-api-key
    https://support.pagerduty.com/docs/generating-api-keys#generating-a-personal-rest-api-key

    In order to send events (with the Pagerduty Events API), you will also need to specify the
    routing_key (or Integration key) in the ``extra`` field

    :param token: PagerDuty API token
    :param pagerduty_conn_id: connection that has PagerDuty API token in the password field
    """

    conn_name_attr = "pagerduty_conn_id"
    default_conn_name = "pagerduty_default"
    conn_type = "pagerduty"
    hook_name = "Pagerduty"

    @classmethod
    def get_ui_field_behaviour(cls) -> dict[str, Any]:
        """Return custom field behaviour."""
        return {
            "hidden_fields": ["port", "login", "schema", "host", "extra"],
            "relabeling": {
                "password": "Pagerduty API token",
            },
        }

    @classmethod
    def get_connection_form_widgets(cls) -> dict[str, Any]:
        """Return connection widgets to add to connection form."""
        from flask_appbuilder.fieldwidgets import BS3PasswordFieldWidget
        from flask_babel import lazy_gettext
        from wtforms import PasswordField
        from wtforms.validators import Optional

        return {
            "routing_key": PasswordField(
                lazy_gettext("Routing Key"),
                widget=BS3PasswordFieldWidget(),
                validators=[Optional()],
                default=None,
            ),
        }

    def __init__(self, token: str | None = None, pagerduty_conn_id: str | None = None) -> None:
        super().__init__()
        self.routing_key = None
        self._session = None

        if pagerduty_conn_id is not None:
            conn = self.get_connection(pagerduty_conn_id)
            self.token = conn.get_password()

            routing_key = conn.extra_dejson.get("routing_key")
            if routing_key:
                self.routing_key = routing_key

        if token is not None:  # token takes higher priority
            self.token = token

        if self.token is None:
            raise AirflowException("Cannot get token: No valid api token nor pagerduty_conn_id supplied.")

    def get_session(self) -> pdpyras.APISession:
        """
        Return `pdpyras.APISession` for use with sending or receiving data through the PagerDuty REST API.

        The `pdpyras` library supplies a class `pdpyras.APISession` extending `requests.Session` from the
        Requests HTTP library.

        Documentation on how to use the `APISession` class can be found at:
        https://pagerduty.github.io/pdpyras/#data-access-abstraction
        """
        self._session = pdpyras.APISession(self.token)
        return self._session

    def test_connection(self):
        try:
            session = pdpyras.APISession(self.token)
            session.list_all("services", params={"query": "some_non_existing_service"})
        except Exception:
            return False, "connection test failed, invalid token"
        return True, "connection tested successfully"
